The United States leads Russia, Iran, China, Qatar, and Canada in global natural gas production. In terms of revenue, China National Petroleum/PetroChina is the world's largest oil and gas company.Who is the largest pipeline company for Natural Gas Specialists?TC Energy is a company. TC Energy is one of the largest natural gas pipeline companies in North America. It operates nearly 58,000 miles of pipeline in the United States, Mexico, and Canada. Its network is responsible for 25% of Europe's gas demand.